If you can say Stevie fluently when alone then you can do it anytime, right? I tell myself this same logic on names or words that I might block on. Finally after many years, I have techniques that help me crack these problem words. Maybe they will help you or somebody else here, they work for me. First of all, try to change your mindset to one of it's a pleasure and privilege to say her name, so enjoy it. Second, as an exercise sit quietly and let the word flow through your mind, don't imagine saying it, just think it instead. Feel it flow through your mind. Take your focus off the mechanics of saying the word and try to say it more from the mind (if that makes sense). Next visualize yourself saying her name fluently in a real situation (again enjoy it). Third, practice saying her name with friends and family as often as possible, if it's too difficult then recruit a loved one to listen to you as you speak descriptively about something inserting Stevie's name as much as possible. These are all exercises that really help me. There's a lot of ways to approach this and I hope you find something that works for you. Good luck.